It depends on your taste. Some people love the imaginative universe and complex plots of Green Lantern comics. However, if you're not into superhero or sci-fi themes, you might not find them as good.
Definitely not. John Diggle and Green Lantern are distinct entities in the comics. Green Lantern has specific powers, origins, and adventures that are separate from those of John Diggle.
Definitely. Green Lantern is indeed from comics. The comic medium gave birth to this character and has developed his story over time, making him a staple in the comic book universe.
I'd recommend 'Green Lantern: Secret Origin'. It gives a deep dive into the origin of the Green Lantern and builds a solid foundation for understanding the character. Also, 'Green Lantern Corps' is excellent, showcasing the teamwork and diversity within the Green Lantern universe.